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Re: Contouring data over maps [message #12462 is a reply to message #12453]

Mon, 03 August 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Jason Hasenbuhler (hasenbuh@rex.cs.tulane.edu) writes:

> I am currently developing an application in IDL that needs to
> draw contour plots
> over a map. My data is irregularly gridded, and very sparse. What I
> need to know
> is how to make IDL respect the land/sea continental boundries when I
> plot my
> interpolated data. I can only currently clip my contour plot to a
> latitude/longitude range..
> I need to know how to make my contour conform to the coastlines.

There is, I feel safe in saying, no easy way to do what
you want to do. I can think of several ways I might approach
the problem, using image masks, pixmaps, loops, etc., but
all of them are ugly as sin and not likely to result in
a pleasant day of IDL programming. :-(

It might be more productive to make the argument to the
powers that be that having contours run over the
continental boundary is actually the PROPER way to
display sparse data. :^)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Contouring data over maps By: wmc on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: Jason Hasenbuhler on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: rjh55 on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: rmlongfield on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: Jason Hasenbuhler on Tue, 04 August 1998 00:00
		Re: Contouring data over maps By: wmc on Tue, 04 August 1998 00:00
		Re: Contouring data over maps By: davidf on Mon, 03 August 1998 00:00

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